2006-10-10 21:59:38 · 18 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Helium.
2006-10-10 22:01:39 · answer #1 · answered by Anonymous · 1⤊ 1⤋
The answer is helium (He):
Hydrogen is the lightest with a density of 0.0899 kg/m^3
Helium is second with a density of 0.1664 kg/m^3
For comparison, air has a density of 1.293 kg/m^3
These values are at standard temperature and pressure (273 K and 101 kPa).
P.S. Deuterium is still hydrogen just with an additional neutron and besides it is still more dense than helium with a density of 0.180 kg/m^3
2006-10-11 00:27:03 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Helium
2006-10-10 22:50:04 · answer #3 · answered by Mark R 2 · 0⤊ 1⤋
The one just a bit heavier than the lightest gas
2006-10-10 22:02:04 · answer #4 · answered by Pete 3 · 0⤊ 3⤋
It is helium. Atomic number 2.
2006-10-10 22:03:30 · answer #5 · answered by Maria 2 · 0⤊ 1⤋
Helium, only hydrogen has more neutrons and protons than helium.
2006-10-10 23:42:38 · answer #6 · answered by shane m 1 · 0⤊ 0⤋
helium- if you really mean 2nd least dense gas.
Heavy/light would depend on quantity of gas that you had or were comparing
2006-10-14 09:22:41 · answer #7 · answered by Clint 6 · 0⤊ 0⤋
Actually your all wrong, In order Hydrogen, Deuterium Helium.
So Deuterium is second.
2006-10-10 23:10:19 · answer #8 · answered by Anonymous · 0⤊ 0⤋
helium, good luck with your exam/homework lol
2006-10-11 01:46:17 · answer #9 · answered by Mr Gravy 3 · 0⤊ 0⤋
helium
2006-10-10 22:02:07 · answer #10 · answered by tma 6 · 1⤊ 1⤋